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SPW3842D
Elektronische Bauelemente
RoHS Compliant Product
High Performance Current Mode Controlers
Description
The SPW3842D is high performance fixed frequency current mode controllers. This is specifically designed for Off-Line and DC TO DC converter applications offering the designer a cost-effective solution with min. external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature compensated reference, high gain Error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltages lockouts each with hysteresis, cycle-by-cycle current limiting, proprammable output deadtime, and latch for single pulse metering.
DIP-8
D
GAUGE PLANE
E
A
SEATING PLANE Z Z
b
L
SECTION Z - Z
Features
* Low Startup And Operating Current * Automatic Feed Forward Compensation
REF. A A1 A2 b b1 b2 b3 c
b
e
* High Current Totem Pole Output * Trimmed Oscillator For Precise Frequency Control * Oscillator Frequency Graranteed At 250kHz * Undervoltage Lockout With Hysteresis * Current Mode Operation To 500kHz * Internally Trimmed Reference With Undervoltage Lockout * Iatching PWM For Cycle-By-Cycle Current Limiting
0.381 2.921 0.356 0.356 1.143 0.762 0.203
Millimeter Min. Max.
REF. c1 D E E1 e HE L
0.5334 4.953 0.559 0.508 1.778 1.143 0.356
0.203 0.279 9.017 10.16 6.096 7.112 7.620 8.255 2.540 BSC 10.92 2.921 3.810
Millimeter Min. Max.
rogrammed by pacitor CT to ground .Operation 500kHz nts up to
DIP-8L
Function Pin1:Compensation Pin2:Voltage Feedback Pin3:Current Sense Pin4:RT/CT Pin5:Ground Pin6:Output Pin7:Vcc Pin8:Vref
Description
This pin is the Error Amplifier output and is made available for loop compensation. This is the reference output .It provides charging current for capacitor CT This is the inverting input of the Error Amplifier. It's normally connected to the Switching power supply output through a resistor divider. A voltage proportional to inductor current is connected to this input .The PWM uses this information to terminate the output switch conduction. The oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and capacitor CT to ground. Operation 500kHz is possible. This pin is the combined control circuitry and power ground. This output directly drives the gate of a power MOSFET. Peak currents up to 1 A are sourced and sunk by this pin. This pin is the positive supply of the control IC. This is the reference output. It provides charging current for capacitor CT through resistor RT.
Any changing of specification will not be informed individual
http://www.SeCoSGmbH.com/
01-Jun-2002 Rev. A
c
Page 1 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
Absolute Maximum Ratings at Ta = 25: :
Parameter Total power Supply and Zener current Output current,source or sink(note1) Output energy(capacitive load per cycle) Current sense and voltage feedback inputs Error Amplifier Output Sink Current Power Dissipation at Thermal characteristics Storage Temperature Range Operating Junction Temperature Operating ambient Temperature Symbol (ICC+Iz) Io W Vin Io PD P JA Tstg TJ TA VALUE 30 1.0 5.0 -0.3 to 5.5 10 702 178 -65 to 150 +150 0~+70 Unit mA A J V mA mW :/W : : :
Electrical Characteristics
Parameter Reference Section Output Voltage Line Regulation Load Regulation Temperature. Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short Circuit current Oscillator Section Frequency
(0 : TA 70 : ,Vcc=15V[note 2],RT=10k,CT=3.3Nf,unless otherwise specified) SYMBOL VREF Regline Regload Ts VREF Vn S ISC Tj=25 : TA=0 : to 70 : Tj=25 : (RT=6.2k,CT=1.0nF) Line, Load, Temperature F=10kHz to 10Hz,Tj=25 : TA=125 : ,1000Hrs 4.82 -30 49 48 225 250 0.2 0.5 1.6 Tj=25 : TA = 0 : to 70 : Vo =2.5V VFB=5.0V Vo=2V to 4V Tj=25 : Vcc=12V to 25V Vo=1.1V,VFB=2.7V Vo=5.0V,VFB=2.3V VFB=2.3V,RL=15K to GND VFB=2.7V,RL=15K to Vref 65 0.7 60 2.0 -0.5 5.0 7.8 7.6 2.42 8.3 8.8 8.8 2.58 -2.0 Test Conditions Tj=25 : ,Io=1mA Vcc=12V to 25V Io=1mA to 20mA Min 4.90 Typ. 5 2.0 3.0 0.2 50 5 -85 52 Max. 5.1 20 25 5.18 -180 55 56 275 1.0 % % V mA KHz Unit V mV mV mV/ : V V mV mA
Frequency Change with Voltage Frequency Change with Temperature Oscillator Voltage Swing(Peak to Peak) Discharge Current Error Amplifier Section Voltage Feedback Input Input Bias Current Open Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio Output Sink Current Output Source Current Output Voltage Swing High State Output Voltage Swing Low State
fosc/ V fosc/ T VOSC Idischg
Vcc=12V to 25V TA = 0 : to 70 :
VFB IIB AVOL BW PSRR Isink Isource VoH VOL
2.50 -0.1 90 1.0 70 12 -1.0 6.2 0.8
V A dB MHz dB mA mA V
1.1
V
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 2 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
Current Sense section Current Sense Input Voltage gain Av (Note 3,4) (Note 3) VCC= 12 to 25V (Note 3) 2.85 0.9 3.0 1.0 70 -2 150 0.1 1.6 13 12 13.5 13.4 0.1 50 50 14.5 8.5 94 16 10 96 0 VCC=14V Note 2 ICC=25mA 30 0.3 12 36 0.5 17 1.1 150 150 17.5 11.5 -10 300 0.4 2.2 3.15 1.1 V/V V dB A ns V V V V V ns ns V V % % mA mA V Maximum Current Sense Input Threshold Vth PSRR Power Supply Rejection Ratio Input Bias Current Propagation Delay Output Low Voltage Output High Level Output Voltage with UVLO Activated Output Voltage Rise Time Output Voltage Fall Time Under-Voltage Lockout Section Startup Threshold PWM Section Maximum Duty Cycle Minimum Duty Cycle Total Device Power Startup Supply Current Power Operating Supply Current Power Supply Zener Voltage ICC+IC ICC+IC Vz DC(MAX) DC(MIN) Vth Min. Operating Voltage After Turn-on(VCC) VCC(min) IIB Tplh(in/out) Current Sense Input to Output VOL Isink=20mA Isink=200mA VOH VOL
(UVLO) tr
Isource=20mA Isource=200mA VCC=6.0V,Isink=1.0mA Tj=25 : ,CL=1nF Tj=25 : ,CL=1nF
tr
Note 1: Maximum Package power dissipation limits must be observed. Note 2: Adject Vcc above the Startup threshold before setting to 15V. Note 3: This parameter is measured at the latch trip point with VFB=0V. Note 4: Comparator gain is defined as::
AV
V Output Compensation V Current Sense Input
Characteristics Curve
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 3 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 4 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 5 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
Application Information
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Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 6 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 7 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 8 of 10
SPW3842D
High Performance Current Mode
Elektronische Bauelemente
Controlers
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 9 of 10
SPW3842D
Elektronische Bauelemente
High Performance Current Mode Controlers
http://www.SeCoSGmbH.com/
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 10 of 10

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